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Kernel: Add UART class for aarch64

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This commit is contained in:
Nico Weber 2021-09-26 14:10:10 -04:00 • committed by Brian Gianforcaro
parent 44c787e88b
commit 54aabb07f9
4 changed files with 224 additions and 6 deletions
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16
Kernel/Prekernel/Arch/aarch64/init.cpp
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@ -5,21 +5,25 @@
*/
#include <AK/Types.h>
#include <Kernel/Prekernel/Arch/aarch64/GPIO.h>
#include <Kernel/Prekernel/Arch/aarch64/Mailbox.h>
#include <Kernel/Prekernel/Arch/aarch64/UART.h>
extern "C" [[noreturn]] void halt();
extern "C" [[noreturn]] void init();
extern "C" [[noreturn]] void init()
{
auto& gpio = Prekernel::GPIO::the();
gpio.set_pin_function(14, Prekernel::GPIO::PinFunction::Alternate0);
gpio.set_pin_function(15, Prekernel::GPIO::PinFunction::Alternate0);
auto& uart = Prekernel::UART::the();
gpio.set_pin_pull_up_down_state(Array { 14, 15 }, Prekernel::GPIO::PullUpDownState::Disable);
uart.print_str("\r\nWelcome to Serenity OS!\r\n");
uart.print_str("Imagine this being your ideal operating system.\r\n");
uart.print_str("Observed deviations from that ideal are shortcomings of your imagination.\r\n\r\n");
u32 firmware_version = Prekernel::Mailbox::query_firmware_version();
uart.print_str("Firmware version: ");
uart.print_num(firmware_version);
uart.print_str("\r\n");
[[maybe_unused]] u32 firmware_version = Prekernel::Mailbox::query_firmware_version();
halt();
}